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Sunday, August 2, 2020 | History

2 edition of Studies of yolk glycoproteins during sea urchin oogenesis found in the catalog.

Studies of yolk glycoproteins during sea urchin oogenesis

Frederick E Harrington

Studies of yolk glycoproteins during sea urchin oogenesis

a thesis in biology

by Frederick E Harrington

  • 332 Want to read
  • 26 Currently reading

Published .
Written in English

    Subjects:
  • Sea urchins -- Eggs,
  • Glycoproteins,
  • Oogenesis

  • Edition Notes

    Other titlesYolk glycoproteins
    Statementby Frederick E. Harrington.
    The Physical Object
    Paginationiv, 41 leaves :
    Number of Pages41
    ID Numbers
    Open LibraryOL22810723M

    Other articles where Yolk sac is discussed: animal development: Adaptations in animals other than mammals: cases a membranous bag, or yolk sac, is formed and remains connected to the embryo by a narrow stalk (the evolutionary precursor of the umbilical cord of mammals). The cellular layers surrounding the yolk sac and forming its walls may consist of all three germinal . Sea urchin skeletons are strengthened by flexible collagenous ligaments that bind together rigid calcite plates at sutures. Whole skeletons without ligaments (removed by bleaching) broke at lower apically applied forces than did intact, fresh skeletons. In addition, in three-point bending tests on excised plate combinations, sutural ligaments strengthened sutures but not by:

    yolk. Soon after gastrulation, the planktotrophic larva pluteus is formed, which has, in most cases, up to four– six pairs of long processes (arms). Pluteus lives in plankton for several weeks and then undergoes meta-morphosis, as a result of which a juvenile sea urchin is formed. This type of development is considered to be. In a developing frog embryo, most of the yolk is A) located near the animal pole. B) located near the vegetal pole. C) found within the cleavage furrow. D) found within the blastocoels. E) distributed equally throughout the embryo. Answer: B.

    During gastrulation, tissue layers are formed and the overall body plan is established. This book is the definitive guide to this vitally important period in embryonic development, providing authoritative and up to date information that includes the first comprehensive interspecies comparison, cell movements and patterning events, the roles of individual genes and gene . Embryology Sea urchin: This webseries containing microscopical preparations was designed to support the courses on developmental biology of the Biosciences program at the Radboud University. The early embryological stages in sea urchin are illustrated by stained in toto preparations of several embryonic stages.


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Studies of yolk glycoproteins during sea urchin oogenesis by Frederick E Harrington Download PDF EPUB FB2

Major yolk protein (MYP) is the most abundant protein found in the yolk granules of sea urchin eggs. The structure of MYPs stored in the eggs of two sea urchin species from Strongylocentrotus intermedius and Mesocentrotus nudus were investigated. Egg-localized major yolk protein (EGMYP) extracted from the eggs of two species of sea urchins was assessed Cited by: 4.

Studies on protein synthesis during sea urchin oogenesis, I. synthesis of histone F2b. (), isolating sea urchin oocytes and incubating them in vitro, were able to isolate some radioactive proteins which showed the same electrophoretic and chromatographic mobility as gastrulae histones, and this was the strongest indication that oocytes Cited by: DEVELOPMENTAL BIOLOGY() Loss of Yolk Platelets and Yolk Glycoproteins during Larval Development of the Sea Urchin Embryo LEANNE B.

SCOTT,*'1 PATRICK S. LEAHY,f GLENN L. DECKER,* AND WILLIAM J. LENNARZ*'2 *Department a/Biochemistry and Molecular Biology, University of Texas M.

Anderson Cancer Center, Holcombe Cited by: Histochemical studies of jelly coat of sea-urchin eggs during oogenesis.

Jondeung A, Czihak G. Jelly coat of sea-urchin eggs consists of polysaccharides and glycoproteins. Some properties of jelly coat have already been investigated, but not histochemically. The oogenesis in Paracentrotus lividus was studied histologically and the oocytes were Cited by:   A histochemical study of the oogenesis of two species of fresh water fishes, Channa maruleus and Heteropneustes fossilis, was undertaken to reveal the origin, structure, histochemical nature, and function of the so-called yolk-nucleus.

The basophilic substance of the yolk-nucleus, which is situated in the juxta-nuclear cytoplasm, gradually accumulates adjacent Cited by: over a century that sea urchin eggs are polarized cells, very little is known about the mechanism responsible for establishing and maintaining polarity.

Our previous studies of microtubule organization during sea urchin oogenesis described a cortical microtubule-organizing center (MTOC) present during germinal vesicle (GV) migration in large. The Major Yolk Protein of Sea Urchins Is Endocytosed by a Dynamin-Dependent Mechanism Article in Biology of Reproduction 71(3) October.

Quantitative changes in yolk protein and other components in the ovary and testis of the sea urchin Pseudocentrotus depressus. Unuma T(1), Yamamoto T, Akiyama T, Shiraishi M, Ohta H. Author information: (1)National Research Institute of Aquaculture, Nansei, MieJapan.

[email protected] by: Sea urchins and their eggs are commonly used as indicator organisms in environmental studies. The Environmental Protection Agency uses sea urchin development standards to test for the presence of water pollution.

Public aquariums use an adult sea urchin's health as an indicator of the water quality in their tanks. Sia-containing glycoconjugates in the sea urchin egg with the aim of understanding the role these carbohydrate chains may play in cell-cell recognition events during fertilization and oogenesis.

The egg of the sea urchin is surrounded by a jelly coat that is known to be carbohydrate rich (). The two major glyco. Start studying Development.

Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. Glycoproteins in the zona pellucida bind to proteins on the acrosome of mature sperm to trigger an acrosome reaction In the sea urchin, these receptors bind to proteins on the sperm called bindins.

Because Vtg is the primary yolk protein in invertebrates, it may have been inferred in earlier studies on echinoderms that the major protein of the yolk granules (major yolk protein (MYP)) is a Vtg. However, sea urchin MYP is not a Vtg; rather, it is a transferrin-like protein that can bind metals such as iron and zinc (Brooks and Wessel, In addition, the early development of sea urchin embryos is highly synchronous, i.e., when a batch of eggs is fertilized, all of the resulting embryos typically develop on the same time course.

This makes biochemical and molecular studies of early embryos possible in this system, and has led to a number of major discoveries. 1) ovum (oocyte) 2) ovary (primordial germ cells are formed in the epiblast during 2nd week of development, then migrate to the wall of the yolk sac, then migrate to the developing gonads by the end of the 5th week).

Why Studying Fertility in Sea Urchins Makes Sense [Excerpt] Google “sea urchin fertilization” and you’ll find dozens of animations and videos of lone sea urchin sperm finding its way home to.

Egg Yolk What is it Deposits formed during oogenesis differentiation of the egg from BIO C19 at University of Toronto. Sea urchin eggs are objects of wonder for the student who sees them for the first time under the microscope. The formation of the fertil­ ization membrane after insemination, the beauty of mitotic cleavage, the elegant swimming of embryos, remain an esthetic pleasure even for the eyes of seasoned investigators.

But sea urchin eggs have other Format: Paperback. Fertilization: Oogenesis. During oogenesis dramatic changes take place within the oocyte.

These include changes in the size, yolk content and distribution, meiotic state of the oocyte, as well as progressive changes in the distribution of maternally supplied mRNAs and proteins that are required for development following fertilization. The morph sequence at the right illustrates the.

To determine whether initiation is rate-limiting in protein synthesis during the embryogenesis of sea urchins, polyribosome profiles of unfertilized eggs and cleavage, blastula and prism stage embryos were examined after incubation of the eggs and embryos in the presence and absence of low amounts of emetine, an inhibitor of polypeptide by: Oogenesis.

The generation of ova or eggs, the female gametes. Primordial germ cells, once they have populated the gonads, proliferate and differentiate into sperm (in the testis).

The unfertilized egg is surrounded by a vitelline membrane (= yolk membrane). The yolk material is distributed evenly over the cytoplasm.

The sea urchin egg is used as a model to study the cleavage in an isolecithal type of egg (iso = even; lecithal = yolk). Stained microscopical slide of the unfertilized egg 1 Vitelline membrane.Formed in the epiblast during 2nd week and move to the wall of yolk sac and reach gonads by end of 5th week In preparation for fertilization germ cells undergo: Gametogenesis Cytodifferentiation; OOGENESIS Is the sequence of events by which germ cells oogonia are transformed into mature oocytes.

OVUM Maturation of oocytes begins before birth.The yolk granule is the most abundant membrane-bound organelle present in the eggs and embryos of many animals including avians, amphibians, insects, mollusks and echinoderms.

The sea urchin yolk granules comprise about one-third of the volume of the egg. The classical view of the yolk granule is that it provides nutrition to the growing embryo, but the finding that the .